System powered test using Caps Lock LED

There are situations when the system is giving indications that it is shut down (no sleep light, no hard drive access, screen is dark, no fan, and so on); however, the logic board may still be active. In this case, the logic board is drawing power and generating heat.

Warning: In this situation, if the computer is placed in an enclosed environment like a carrying bag, the computer can overheat.

You can potentially verify this situation by pressing the Caps Lock key. If the LED glows, the power manager is actively running on the logic board. If pressing the Caps Lock key or other attempts to wake the machine have failed (including closing the lid to put it to sleep and reopening it to wake it), hold the power button down for six seconds to force a shutdown of the computer. Restart the system to check that it starts up normally.

Note: Given that the keyboard in MacBook Pro is a USB device, it may not respond if the operating system has crashed. Thus, despite the fact that the caps lock LED does not light up, the computer may still be drawing power. If in doubt, hold the power button down for six seconds to force a shutdown of the computer.

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